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Design considerations for multiple seam mining with case studies of subsidence and pillar load transfer.

Authors
Matetic RJ; Chekan GJ; Galek JA
Source
Rock mechanics: proceedings of the 28th U.S. Symposium on Rock Mechanics, June 29 - July 1, 1987, Tucson, Arizona. Farmer IW, Dacmen JJK, Desai CS, Neuman SP, eds. Boston, MA: A. A. Balkema, 1987 Jun; :1095-1106
NIOSHTIC No.
10005556
Abstract
The Bureau of Mines, as part of a program to improve mine planning and development is currently investigating interactions associated with multiple-seam mining. Two common interactions that occur between adjacent coalbeds are subsidence and pillar load transfer. This study involves underground observations and measurements at two mines each affected by these interactions. At the mine affected by pillar load transfer, overburden depth reached a maximum of 1,000 ft (303 m) in the problem area; innerburden thickness was less than a pillar width (30 to 35 ft) (9.1 to 10.6 m); and instrumented pillars in the upper mine showed a ratio of pillar core pressure to skin pressure of 8:1. At the mine affected by subsidence, measurements showed that undermining had little effect on upper mine pillar stability, but had a more severe effect on the development and maintenance of entries. Roof-to-floor measurements recorded over four times more convergence in entries developed over gob as compared with entries developed over support pillars in the lower mine. Alternative design and ground support considerations are discussed for both case studies.
Keywords
Mining; Rock mechanics; Coal mines; Coal seams; Subsidence; Pillar design; Pillar mechanics; Case studies
Publication Date
19870629
Document Type
OP; Conference/Symposia Proceedings
Editors
Farmer IW; Dacmen JJK; Desai CS; Neuman SP
Fiscal Year
1987
NTIS Accession No.
NTIS Price
ISBN No.
9789061916994
Identifying No.
OP 203-91
NIOSH Division
PRC
Source Name
Rock mechanics: proceedings of the 28th U.S. Symposium on Rock Mechanics, June 29 - July 1, 1987, Tucson, Arizona
State
PA; AZ
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